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id="post-meta"><div class="meta-firstline"><span class="post-meta-date"><svg class="meta_icon post-meta-icon" style="width:30px;height:30px;position:relative;top:10px"><use xlink:href="#icon-rili"></use></svg><span class="post-meta-label">发表于 </span><time class="post-meta-date-created" datetime="2022-06-20T10:01:02.000Z" title="发表于 2022-06-20 18:01:02">2022-06-20</time><span class="post-meta-separator">|</span><svg class="meta_icon post-meta-icon" style="width:18px;height:18px;position:relative;top:5px"><use xlink:href="#icon-gengxin1"></use></svg><span class="post-meta-label">更新于</span><time class="post-meta-date-updated" datetime="2024-04-26T09:52:18.927Z" title="更新于 2024-04-26 17:52:18">2024-04-26</time></span><span class="post-meta-categories"><span class="post-meta-separator">|</span><svg class="meta_icon post-meta-icon" style="width:18px;height:18px;position:relative;top:5px"><use xlink:href="#icon-biaoqian"></use></svg><a class="post-meta-categories" href="/categories/%E4%B8%AD%E9%97%B4%E4%BB%B6/">中间件</a><i class="fas fa-angle-right post-meta-separator"></i><svg class="meta_icon post-meta-icon" style="width:18px;height:18px;position:relative;top:5px"><use xlink:href="#icon-biaoqian"></use></svg><a class="post-meta-categories" href="/categories/%E4%B8%AD%E9%97%B4%E4%BB%B6/Redis/">Redis</a></span></div><div class="meta-secondline"><span class="post-meta-separator">|</span><span class="post-meta-wordcount"><svg class="meta_icon post-meta-icon" style="width:25px;height:25px;position:relative;top:8px"><use xlink:href="#icon-charuword"></use></svg><span class="post-meta-label">字数总计:</span><span class="word-count">3573</span><span class="post-meta-separator">|</span><svg class="meta_icon post-meta-icon" style="width:20px;height:20px;position:relative;top:5px"><use xlink:href="#icon-shizhong"></use></svg><span class="post-meta-label">阅读时长:</span><span>15分钟</span></span><span class="post-meta-separator">|</span><span class="post-meta-pv-cv" id="" data-flag-title="Redis"><svg class="meta_icon post-meta-icon" style="width:25px;height:25px;position:relative;top:5px"><use xlink:href="#icon-eye"></use></svg><span class="post-meta-label">阅读量:</span><span id="busuanzi_value_page_pv"><i class="fa-solid fa-spinner fa-spin"></i></span></span></div></div></div><section class="main-hero-waves-area waves-area"><svg class="waves-svg" xmlns="http://www.w3.org/2000/svg" xlink="http://www.w3.org/1999/xlink" viewBox="0 24 150 28" preserveAspectRatio="none" shape-rendering="auto"><defs><path id="gentle-wave" d="M -160 44 c 30 0 58 -18 88 -18 s 58 18 88 18 s 58 -18 88 -18 s 58 18 88 18 v 44 h -352 Z"></path></defs><g class="parallax"><use href="#gentle-wave" x="48" y="0"></use><use href="#gentle-wave" x="48" y="3"></use><use href="#gentle-wave" x="48" y="5"></use><use href="#gentle-wave" x="48" y="7"></use></g></svg></section></header><main class="layout" id="content-inner"><div id="post"><article class="post-content" id="article-container"><h1 id="Redis"><a href="#Redis" class="headerlink" title="Redis"></a>Redis</h1><h2 id="一、Redis的安装和启动和关闭"><a href="#一、Redis的安装和启动和关闭" class="headerlink" title="一、Redis的安装和启动和关闭"></a>一、Redis的安装和启动和关闭</h2><blockquote>
<p><strong>安装：在Linux中使用 wegt 命令下载，或使用 xftp 软件传入Linux中，使用如下命令解压安装</strong></p>
</blockquote>
<figure class="highlight go"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">//使用wegt命令下载或使用xftp传输文件</span></span><br><span class="line">wegt <span class="string">`下载地址去官网搜索`</span></span><br><span class="line"></span><br><span class="line"><span class="comment">//使用解压命令</span></span><br><span class="line">tar -xvf <span class="string">`压缩包文件名`</span></span><br><span class="line"></span><br><span class="line"><span class="comment">//使用如下命令安装</span></span><br><span class="line"><span class="built_in">make</span> &amp;&amp; <span class="built_in">make</span> install</span><br></pre></td></tr></table></figure>
<blockquote>
<p><strong>启动</strong></p>
</blockquote>
<div class="table-container">
<table>
<thead>
<tr>
<th>命令</th>
<th>作用</th>
</tr>
</thead>
<tbody>
<tr>
<td>redis-benchmark</td>
<td>性能测试工具，可以在自己本子运行，看看自己本子性能如何</td>
</tr>
<tr>
<td>redis-check-aof</td>
<td>修复有问题的AOF文件，rdb和aof后面讲</td>
</tr>
<tr>
<td>redis-check-dump</td>
<td>修复有问题的dump.rdb文件</td>
</tr>
<tr>
<td>redis-sentinel</td>
<td>Redis集群使用</td>
</tr>
<tr>
<td>redis-server（不建议使用）</td>
<td>Redis服务器启动命令</td>
</tr>
<tr>
<td>redis-cli</td>
<td>客户端，操作入口</td>
</tr>
</tbody>
</table>
</div>
<ul>
<li><p>前台启动（不推荐）</p>
<p>  使用  redis-server    ，窗口不能关闭，服务器停止</p>
</li>
</ul>
<ul>
<li><p>后台启动（推荐）</p>
<ul>
<li>备份    redis.cong文件，这里拷贝一份文件到 etc目录下面</li>
<li>需要将    redis.conf    文件中的  daemonize no 改成yes</li>
<li>启动命令：redis-server    /etc/redis.conf</li>
</ul>
</li>
</ul>
<ul>
<li>客户端访问：redis-cli  /  redis-cli  —raw 【 方式一：不能读取中文，方式二，可以读取中文】</li>
</ul>
<blockquote>
<p><strong>关闭</strong></p>
</blockquote>
<ul>
<li><p>单实例关闭：redis-cli shutdown：</p>
<p>  <img src= "" data-lazy-src="https://www.naste.top:9000/webp/image-20210526172727665.webp" alt="image-20210526172727665"></p>
</li>
<li><p>redis-cli 进入终端关闭：</p>
<p>  <img src= "" data-lazy-src="https://www.naste.top:9000/webp/image-20210526172924480.webp" alt="image-20210526172924480"></p>
</li>
<li><p>多实例关闭：指定端口号关闭</p>
<ul>
<li><p>方式一：</p>
  <figure class="highlight avrasm"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">redis-<span class="keyword">cli</span> -p 端口号 shuwdown</span><br></pre></td></tr></table></figure>
</li>
<li><p>方式二：</p>
  <figure class="highlight perl"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line">ps -ef | <span class="keyword">grep</span> <span class="string">&#x27;进程名字&#x27;</span></span><br><span class="line">例如：ps -ef | <span class="keyword">grep</span> tomcat</span><br><span class="line"></span><br><span class="line"><span class="keyword">kill</span> -<span class="number">9</span> <span class="string">`通过进程查询id号，通过查到的id删除j`</span></span><br></pre></td></tr></table></figure>
</li>
</ul>
</li>
</ul>
<h2 id="二、常用五大数据类型"><a href="#二、常用五大数据类型" class="headerlink" title="二、常用五大数据类型"></a>二、常用五大数据类型</h2><p>redis数据库常用操作命令：<a target="_blank" rel="noopener" href="http://www.redis.cn/commands.html">http://www.redis.cn/commands.html</a></p>
<h3 id="Redis键值（key）"><a href="#Redis键值（key）" class="headerlink" title="Redis键值（key）"></a>Redis键值（key）</h3><div class="table-container">
<table>
<thead>
<tr>
<th>命令</th>
<th>作用</th>
</tr>
</thead>
<tbody>
<tr>
<td>keys <em>  【keys </em>2】</td>
<td>查询当前库所有key 【查询指定库】</td>
</tr>
<tr>
<td>exists key</td>
<td>判断某个key是否存在</td>
</tr>
<tr>
<td>type key</td>
<td>查看你的key是什么类型</td>
</tr>
<tr>
<td>del key</td>
<td>删除指定的key数据</td>
</tr>
<tr>
<td>unlink key</td>
<td>根据value选择非阻塞删除，仅将keys从keyspace元数据中删除，真正的删除会在后续异步操作。</td>
</tr>
<tr>
<td>expire key 10</td>
<td>10秒中：为指定的key设置过期时间</td>
</tr>
<tr>
<td>ttl key</td>
<td>查看还有多少秒过期，-1 表示永不过期，-2 表示已过期</td>
</tr>
<tr>
<td>select  <code>指定数据库序号</code></td>
<td>切换数据库</td>
</tr>
<tr>
<td>dbsize</td>
<td>查看当前数据库的key的数量</td>
</tr>
<tr>
<td>flushdb</td>
<td>清空当前数据库</td>
</tr>
<tr>
<td>flushall</td>
<td>通杀全部数据库</td>
</tr>
</tbody>
</table>
</div>
<h3 id="Redis-字符串（String）"><a href="#Redis-字符串（String）" class="headerlink" title="Redis 字符串（String）"></a>Redis 字符串（String）</h3><p>String是Redis最基本的类型，你可以理解成与Memcached一模一样的类型，一个key对应一个value。</p>
<p>String类型是二进制安全的。意味着Redis的string可以包含任何数据。比如jpg图片或者序列化的对象。</p>
<p>String类型是Redis最基本的数据类型，一个Redis中字符串value最多可以是512M</p>
<div class="table-container">
<table>
<thead>
<tr>
<th>命令</th>
<th>作用</th>
</tr>
</thead>
<tbody>
<tr>
<td>set  <key>  <value></td>
<td>添加键值对</td>
</tr>
<tr>
<td>get <key></td>
<td>查询对应的键值</td>
</tr>
<tr>
<td>append <key> <value></td>
<td>将给定的<value>追加到原值的末尾</td>
</tr>
<tr>
<td>strlen <key></td>
<td>获取值的长度</td>
</tr>
<tr>
<td>incr <key></td>
<td>将key中存储的数字值增1，只能对数字操作，如果为空，新增值为1</td>
</tr>
<tr>
<td>decr <key></td>
<td>将key中存储的数字值减1，只能对数字值操作，如果为空，新增值为-1</td>
</tr>
<tr>
<td>incrby / decrby <key> &lt;步长&gt;</td>
<td>将key中存储的数字值增减，自定义步长</td>
</tr>
<tr>
<td>mset <key> <value> [ <key> <value> … ]</td>
<td>同时设置一个或多个key-value</td>
</tr>
<tr>
<td>mget <key> [ <key> ….. ]</td>
<td>同时获取一个或多个value</td>
</tr>
<tr>
<td>msetnx  <key> <value> [ <key> <value> … ]</td>
<td>同时设置一个或多个key-value，当所有的key都不存在时将插入，如果有一个key已存在，所有的key将插入失败</td>
</tr>
<tr>
<td>getrange <key> &lt;起始位置&gt; &lt;结束位置&gt;</td>
<td>获得值的范围，类似Java中substring，前包，后包</td>
</tr>
<tr>
<td>setrange <key> &lt;起始位置&gt; <value></td>
<td>用<value>覆写<key>所存储的字符串值，从&lt;起始位置&gt;开始 <strong>（索引从0开始）</strong></td>
</tr>
<tr>
<td>setex <key> &lt;过期时间&gt; <value></td>
<td>设置键的同时，设置过期时间，单位秒</td>
</tr>
<tr>
<td>getset <key> <value></td>
<td>以旧换新，设置了新值的同时获得旧值</td>
</tr>
</tbody>
</table>
</div>
<blockquote>
<p><strong>set 命令中的属性值的问题</strong></p>
</blockquote>
<p><img src= "" data-lazy-src="https://www.naste.top:9000/webp/image-20210526184545861.webp" alt="image-20210526184545861"></p>
<div class="table-container">
<table>
<thead>
<tr>
<th>属性</th>
<th>作用</th>
</tr>
</thead>
<tbody>
<tr>
<td>*EX</td>
<td>key的超时秒数</td>
</tr>
<tr>
<td>*PX</td>
<td>key的超时秒数，与EX互斥</td>
</tr>
<tr>
<td>*NX</td>
<td>当数据库中的key不存在时，可以将key-value添加到数据库中</td>
</tr>
<tr>
<td>*XX</td>
<td>当数据库中的key存在时，可以将key-value添加到数据库中，与NX参数互斥</td>
</tr>
</tbody>
</table>
</div>
<h3 id="Redis列表（List）"><a href="#Redis列表（List）" class="headerlink" title="Redis列表（List）"></a>Redis列表（List）</h3><p><strong>在Redis中列表是一个双向链表</strong></p>
<div class="table-container">
<table>
<thead>
<tr>
<th>命令</th>
<th>作用</th>
</tr>
</thead>
<tbody>
<tr>
<td>lpush / rpush <key> <value1> <value2> ….</td>
<td>从左边 / 右边插入一个或多个值</td>
</tr>
<tr>
<td>lpop / rpop <key></td>
<td>从左边  / 右边吐出一个值。<strong>值在键在，值亡键亡</strong>，值取出就没了</td>
</tr>
<tr>
<td>rpoplpush <key1> <key2></td>
<td>从<key1>列表右边吐出一个值，插到<key2>列表左边</td>
</tr>
<tr>
<td>lrange <key> <star> <stop></td>
<td>按照索引下标获得元素（从左到右）</td>
</tr>
<tr>
<td>lrange mylist 0 -1</td>
<td>0 左边第一个，-1 右边第一个 （ 0 -1）表示获取所有</td>
</tr>
<tr>
<td>lindex <key> <index></td>
<td>按照索引下标获得元素（从左到右）</td>
</tr>
<tr>
<td>lien <key></td>
<td>获得列表长度</td>
</tr>
<tr>
<td>linsert<key> before <value> <newvalue></td>
<td>在 <value>的后面插入<newvalue></td>
</tr>
<tr>
<td>lrem <key> <n> <value></td>
<td>从左边删除第n个value（从左到右）</td>
</tr>
<tr>
<td>lset <key> <index> <value></td>
<td>将列表key下标为index的值替换成为value</td>
</tr>
</tbody>
</table>
</div>
<h3 id="Redis集合（Set）"><a href="#Redis集合（Set）" class="headerlink" title="Redis集合（Set）"></a>Redis集合（Set）</h3><p><strong>当你需要存储一个列表数据，又不希望出现重复数据时，set是一个很好的选择</strong></p>
<div class="table-container">
<table>
<thead>
<tr>
<th>sadd <key><value1><value2></th>
<th>将一个或多个 member 元素加入到集合 key 中，已经存在的 member 元素将被忽略</th>
</tr>
</thead>
<tbody>
<tr>
<td>smembers <key></td>
<td>取出该集合的所有值。</td>
</tr>
<tr>
<td>sismember <key><value></td>
<td>判断集合<key>是否为含有该<value>值，有1，没有0</td>
</tr>
<tr>
<td>scard <key></td>
<td>返回该集合的元素个数。</td>
</tr>
<tr>
<td>srem <key><value1><value2> ….</td>
<td>删除集合中的某个元素。</td>
</tr>
<tr>
<td>spop <key></td>
<td><strong>随机从该集合中吐出一个值。</strong></td>
</tr>
<tr>
<td>srandmember <key><n></td>
<td>随机从该集合中取出n个值。不会从集合中删除 。</td>
</tr>
<tr>
<td>smove <source><destination>value</td>
<td>把集合中一个值从一个集合移动到另一个集合</td>
</tr>
<tr>
<td>sinter <key1><key2></td>
<td>返回两个集合的交集元素。</td>
</tr>
<tr>
<td>sunion <key1><key2></td>
<td>返回两个集合的并集元素。</td>
</tr>
<tr>
<td>sdiff <key1><key2></td>
<td>返回两个集合的<strong>差集</strong>元素(key1中的，不包含key2中的)</td>
</tr>
</tbody>
</table>
</div>
<h2 id="三、SpringBoot整合Redis"><a href="#三、SpringBoot整合Redis" class="headerlink" title="三、SpringBoot整合Redis"></a>三、SpringBoot整合Redis</h2><ol>
<li><p>导入Jar包</p>
 <figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">dependency</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">groupId</span>&gt;</span>org.springframework.boot<span class="tag">&lt;/<span class="name">groupId</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">artifactId</span>&gt;</span>spring-boot-starter-data-redis<span class="tag">&lt;/<span class="name">artifactId</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">dependency</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">dependency</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">groupId</span>&gt;</span>org.apache.commons<span class="tag">&lt;/<span class="name">groupId</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">artifactId</span>&gt;</span>commons-pool2<span class="tag">&lt;/<span class="name">artifactId</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">dependency</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">dependency</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">groupId</span>&gt;</span>org.springframework.boot<span class="tag">&lt;/<span class="name">groupId</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">artifactId</span>&gt;</span>spring-boot-starter-web<span class="tag">&lt;/<span class="name">artifactId</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">dependency</span>&gt;</span></span><br></pre></td></tr></table></figure>
</li>
<li><p>配置文件：</p>
 <figure class="highlight properties"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">#Redis服务器地址</span></span><br><span class="line"><span class="attr">spring.redis.host</span>=<span class="string">192.168.140.136</span></span><br><span class="line"><span class="comment">#Redis服务器连接端口</span></span><br><span class="line"><span class="attr">spring.redis.port</span>=<span class="string">6379</span></span><br><span class="line"><span class="comment">#Redis数据库索引（默认为0）</span></span><br><span class="line"><span class="attr">spring.redis.database</span>= <span class="string">0</span></span><br><span class="line"><span class="comment">#连接超时时间（毫秒）</span></span><br><span class="line"><span class="attr">spring.redis.timeout</span>=<span class="string">1800000</span></span><br><span class="line"><span class="comment">#连接池最大连接数（使用负值表示没有限制）</span></span><br><span class="line"><span class="attr">spring.redis.lettuce.pool.max-active</span>=<span class="string">20</span></span><br><span class="line"><span class="comment">#最大阻塞等待时间(负数表示没限制)</span></span><br><span class="line"><span class="attr">spring.redis.lettuce.pool.max-wait</span>=<span class="string">-1</span></span><br><span class="line"><span class="comment">#连接池中的最大空闲连接</span></span><br><span class="line"><span class="attr">spring.redis.lettuce.pool.max-idle</span>=<span class="string">5</span></span><br><span class="line"><span class="comment">#连接池中的最小空闲连接</span></span><br><span class="line"><span class="attr">spring.redis.lettuce.pool.min-idle</span>=<span class="string">0</span></span><br><span class="line"><span class="comment">#使用springboot集群需要设置spring.redis.cluster.nodes的值</span></span><br><span class="line"><span class="attr">spring.redis.cluster.nodes</span>=<span class="string">192.168.162.132:6380</span></span><br></pre></td></tr></table></figure>
</li>
</ol>
<ol>
<li><p>编写配置类：</p>
 <figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">package</span> com.lf.config;</span><br><span class="line"></span><br><span class="line"><span class="keyword">import</span> com.fasterxml.jackson.annotation.JsonAutoDetect;</span><br><span class="line"><span class="keyword">import</span> com.fasterxml.jackson.annotation.PropertyAccessor;</span><br><span class="line"><span class="keyword">import</span> com.fasterxml.jackson.databind.ObjectMapper;</span><br><span class="line"><span class="keyword">import</span> org.springframework.cache.CacheManager;</span><br><span class="line"><span class="keyword">import</span> org.springframework.context.annotation.Bean;</span><br><span class="line"><span class="keyword">import</span> org.springframework.context.annotation.Configuration;</span><br><span class="line"><span class="keyword">import</span> org.springframework.data.redis.cache.RedisCacheConfiguration;</span><br><span class="line"><span class="keyword">import</span> org.springframework.data.redis.cache.RedisCacheManager;</span><br><span class="line"><span class="keyword">import</span> org.springframework.data.redis.connection.RedisConnectionFactory;</span><br><span class="line"><span class="keyword">import</span> org.springframework.data.redis.core.RedisTemplate;</span><br><span class="line"><span class="keyword">import</span> org.springframework.data.redis.serializer.Jackson2JsonRedisSerializer;</span><br><span class="line"><span class="keyword">import</span> org.springframework.data.redis.serializer.RedisSerializationContext;</span><br><span class="line"><span class="keyword">import</span> org.springframework.data.redis.serializer.RedisSerializer;</span><br><span class="line"><span class="keyword">import</span> org.springframework.data.redis.serializer.StringRedisSerializer;</span><br><span class="line"></span><br><span class="line"><span class="keyword">import</span> java.time.Duration;</span><br><span class="line"></span><br><span class="line"></span><br><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * Redis的配置类</span></span><br><span class="line"><span class="comment"> * User: 李飞</span></span><br><span class="line"><span class="comment"> * Date: 2021/5/27</span></span><br><span class="line"><span class="comment"> * Time: 8:28</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="meta">@Configuration</span></span><br><span class="line"><span class="keyword">public</span> <span class="keyword">class</span> <span class="title class_">RedisConfig</span> &#123;</span><br><span class="line">    <span class="meta">@Bean</span></span><br><span class="line">    <span class="keyword">public</span> RedisTemplate&lt;String, Object&gt; <span class="title function_">redisTemplate</span><span class="params">(RedisConnectionFactory factory)</span> &#123;</span><br><span class="line">        RedisTemplate&lt;String, Object&gt; template = <span class="keyword">new</span> <span class="title class_">RedisTemplate</span>&lt;&gt;();</span><br><span class="line">        RedisSerializer&lt;String&gt; redisSerializer = <span class="keyword">new</span> <span class="title class_">StringRedisSerializer</span>();</span><br><span class="line">        <span class="type">Jackson2JsonRedisSerializer</span> <span class="variable">jackson2JsonRedisSerializer</span> <span class="operator">=</span> <span class="keyword">new</span> <span class="title class_">Jackson2JsonRedisSerializer</span>(Object.class);</span><br><span class="line">        <span class="type">ObjectMapper</span> <span class="variable">om</span> <span class="operator">=</span> <span class="keyword">new</span> <span class="title class_">ObjectMapper</span>();</span><br><span class="line">        om.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY);</span><br><span class="line">        om.enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL);</span><br><span class="line">        jackson2JsonRedisSerializer.setObjectMapper(om);</span><br><span class="line">        template.setConnectionFactory(factory);</span><br><span class="line">        <span class="comment">//key序列化方式</span></span><br><span class="line">        template.setKeySerializer(redisSerializer);</span><br><span class="line">        <span class="comment">//value序列化</span></span><br><span class="line">        template.setValueSerializer(jackson2JsonRedisSerializer);</span><br><span class="line">        <span class="comment">//value hashmap序列化</span></span><br><span class="line">        template.setHashValueSerializer(jackson2JsonRedisSerializer);</span><br><span class="line">        <span class="keyword">return</span> template;</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="meta">@Bean</span></span><br><span class="line">    <span class="keyword">public</span> CacheManager <span class="title function_">cacheManager</span><span class="params">(RedisConnectionFactory factory)</span> &#123;</span><br><span class="line">        RedisSerializer&lt;String&gt; redisSerializer = <span class="keyword">new</span> <span class="title class_">StringRedisSerializer</span>();</span><br><span class="line">        <span class="type">Jackson2JsonRedisSerializer</span> <span class="variable">jackson2JsonRedisSerializer</span> <span class="operator">=</span> <span class="keyword">new</span> <span class="title class_">Jackson2JsonRedisSerializer</span>(Object.class);</span><br><span class="line">        <span class="comment">//解决查询缓存转换异常的问题</span></span><br><span class="line">        <span class="type">ObjectMapper</span> <span class="variable">om</span> <span class="operator">=</span> <span class="keyword">new</span> <span class="title class_">ObjectMapper</span>();</span><br><span class="line">        om.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY);</span><br><span class="line">        om.enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL);</span><br><span class="line">        jackson2JsonRedisSerializer.setObjectMapper(om);</span><br><span class="line">        <span class="comment">// 配置序列化（解决乱码的问题）,过期时间600秒</span></span><br><span class="line">        <span class="type">RedisCacheConfiguration</span> <span class="variable">config</span> <span class="operator">=</span> RedisCacheConfiguration.defaultCacheConfig()</span><br><span class="line">                .entryTtl(Duration.ofSeconds(<span class="number">600</span>))</span><br><span class="line">                .serializeKeysWith(RedisSerializationContext.SerializationPair.fromSerializer(redisSerializer))</span><br><span class="line">                .serializeValuesWith(RedisSerializationContext.SerializationPair.fromSerializer(jackson2JsonRedisSerializer))</span><br><span class="line">                .disableCachingNullValues();</span><br><span class="line">        <span class="type">RedisCacheManager</span> <span class="variable">cacheManager</span> <span class="operator">=</span> RedisCacheManager.builder(factory)</span><br><span class="line">                .cacheDefaults(config)</span><br><span class="line">                .build();</span><br><span class="line">        <span class="keyword">return</span> cacheManager;</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
</li>
<li><p>测试：</p>
 <figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">package</span> com.lf.controller;</span><br><span class="line"></span><br><span class="line"><span class="keyword">import</span> org.springframework.beans.factory.annotation.Autowired;</span><br><span class="line"><span class="keyword">import</span> org.springframework.data.redis.core.RedisTemplate;</span><br><span class="line"><span class="keyword">import</span> org.springframework.web.bind.annotation.GetMapping;</span><br><span class="line"><span class="keyword">import</span> org.springframework.web.bind.annotation.RestController;</span><br><span class="line"></span><br><span class="line"><span class="meta">@RestController</span></span><br><span class="line"><span class="keyword">public</span> <span class="keyword">class</span> <span class="title class_">RedisController</span> &#123;</span><br><span class="line">    <span class="meta">@Autowired</span></span><br><span class="line">    <span class="keyword">private</span> RedisTemplate redisTemplate;</span><br><span class="line"></span><br><span class="line">    <span class="meta">@GetMapping(&quot;/&quot;)</span></span><br><span class="line">    <span class="keyword">public</span> String <span class="title function_">testRedis</span><span class="params">()</span> &#123;</span><br><span class="line">        <span class="comment">//设置值到redis</span></span><br><span class="line">        redisTemplate.opsForValue().set(<span class="string">&quot;name&quot;</span>, <span class="string">&quot;lucy&quot;</span>);</span><br><span class="line">        <span class="comment">//从redis获取值</span></span><br><span class="line">        <span class="type">String</span> <span class="variable">name</span> <span class="operator">=</span> (String) redisTemplate.opsForValue().get(<span class="string">&quot;name&quot;</span>);</span><br><span class="line">        <span class="keyword">return</span> name;</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
</li>
</ol>
<h2 id="四、Redis-事务"><a href="#四、Redis-事务" class="headerlink" title="四、Redis_事务"></a>四、Redis_事务</h2><h2 id="五、秒杀问题"><a href="#五、秒杀问题" class="headerlink" title="五、秒杀问题"></a>五、秒杀问题</h2><h3 id="1、每次只有一个用户进行秒杀"><a href="#1、每次只有一个用户进行秒杀" class="headerlink" title="1、每次只有一个用户进行秒杀"></a>1、每次只有一个用户进行秒杀</h3><ol>
<li><p>导包：看使用SpringMVC还是SpringBoot再导其他包</p>
 <figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">dependency</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">groupId</span>&gt;</span>redis.clients<span class="tag">&lt;/<span class="name">groupId</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">artifactId</span>&gt;</span>jedis<span class="tag">&lt;/<span class="name">artifactId</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">dependency</span>&gt;</span></span><br></pre></td></tr></table></figure>
</li>
<li><p>Java代码</p>
 <figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="type">boolean</span> <span class="title function_">doSecKill</span><span class="params">( String prodId,  String userId)</span> &#123;</span><br><span class="line">    <span class="comment">//1、userId和prodId非空判断</span></span><br><span class="line">    <span class="keyword">if</span> (userId == <span class="literal">null</span> || prodId == <span class="literal">null</span>) &#123;</span><br><span class="line">        <span class="keyword">return</span> <span class="literal">false</span>;</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="comment">//2、连接jedis</span></span><br><span class="line">    <span class="type">Jedis</span> <span class="variable">jedis</span> <span class="operator">=</span> <span class="keyword">new</span> <span class="title class_">Jedis</span>(<span class="string">&quot;192.168.162.132&quot;</span>, <span class="number">6379</span>);</span><br><span class="line"></span><br><span class="line"></span><br><span class="line">    <span class="comment">//3 拼接key</span></span><br><span class="line">    <span class="comment">// 3.1 库存key</span></span><br><span class="line">    <span class="type">String</span> <span class="variable">kcKey</span> <span class="operator">=</span> <span class="string">&quot;sk:&quot;</span> + prodId + <span class="string">&quot;:qt&quot;</span>;</span><br><span class="line">    <span class="comment">// 3.2 秒杀成功用户key</span></span><br><span class="line">    <span class="type">String</span> <span class="variable">userKey</span> <span class="operator">=</span> <span class="string">&quot;sk:&quot;</span> + prodId + <span class="string">&quot;:user&quot;</span>;</span><br><span class="line"></span><br><span class="line">    <span class="comment">//监视库存</span></span><br><span class="line">    jedis.watch(kcKey);</span><br><span class="line"></span><br><span class="line">    <span class="type">Object</span> <span class="variable">key</span> <span class="operator">=</span> jedis.get(kcKey);</span><br><span class="line">    <span class="comment">//4、获取库存，如果库存null，秒杀还没有开始</span></span><br><span class="line">    <span class="keyword">if</span> (key == <span class="literal">null</span>) &#123;</span><br><span class="line">        System.out.println(<span class="string">&quot;秒杀还没有开始，请等待&quot;</span>);</span><br><span class="line">        jedis.close();</span><br><span class="line">        <span class="keyword">return</span> <span class="literal">false</span>;</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="comment">//5、判断用户是否重复秒杀操作，判断用户的key是否已经存在了，存在则不能秒杀了</span></span><br><span class="line">    <span class="keyword">if</span> (jedis.sismember(userKey, userId)) &#123;</span><br><span class="line">        System.out.println(<span class="string">&quot;已经秒杀成功，不能重复秒杀&quot;</span>);</span><br><span class="line">        jedis.close();</span><br><span class="line">        <span class="keyword">return</span> <span class="literal">false</span>;</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="comment">//6、判断如果剩余商品数量，库存数量小于1，秒杀结束</span></span><br><span class="line">    <span class="keyword">if</span> (Integer.parseInt(jedis.get(kcKey)) &lt; <span class="number">1</span>) &#123;</span><br><span class="line">        System.out.println(<span class="string">&quot;秒杀已结束&quot;</span>);</span><br><span class="line">        jedis.close();</span><br><span class="line">        <span class="keyword">return</span> <span class="literal">false</span>;</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="comment">//7、秒杀过程，将用户的key存入set集合中，set集合中的值不能有重复的</span></span><br><span class="line">    jedis.sadd(userKey, userId);</span><br><span class="line">    System.out.println(<span class="string">&quot;秒杀成功&quot;</span>);</span><br><span class="line"></span><br><span class="line">    <span class="comment">//7.1、库存-1，decr：使数字类型的数据减 1</span></span><br><span class="line">    jedis.decr(kcKey);</span><br><span class="line">    jedis.close();</span><br><span class="line"></span><br><span class="line">    <span class="comment">//7.2、把秒杀成功用户添加到清单里面</span></span><br><span class="line"></span><br><span class="line">    <span class="keyword">return</span> <span class="literal">true</span>;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
</li>
</ol>
<h3 id="2、模拟高并发下的场景进行秒杀"><a href="#2、模拟高并发下的场景进行秒杀" class="headerlink" title="2、模拟高并发下的场景进行秒杀"></a>2、模拟高并发下的场景进行秒杀</h3><p><strong>模拟多个用户同时进行秒杀</strong></p>
<blockquote>
<p><strong>在高并发的场景下面可能会出现的问题和解决方案</strong></p>
</blockquote>
<ul>
<li><p>模拟高并发：在Linux中ab模拟测试工具：</p>
  <figure class="highlight awk"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">#选择安装</span></span><br><span class="line">yum install httpd-tools</span><br><span class="line"></span><br><span class="line"><span class="comment">#使用：</span></span><br><span class="line">ab</span><br><span class="line">-n 填写请求数量</span><br><span class="line">-c 填写并发数量</span><br><span class="line">-p 填写提交的参数，可以传入文件</span><br><span class="line">-T 提交的参数的类型，就是表单中enctype的值</span><br><span class="line">最后再填写请求的路径</span><br><span class="line"></span><br><span class="line"><span class="comment">#例：</span></span><br><span class="line">ab -n <span class="number">1000</span> -c <span class="number">100</span>  -p ~<span class="regexp">/postfile -T application/</span>x-www-form-urlencoded http:<span class="regexp">//</span>http:<span class="regexp">//</span><span class="number">192.168</span>.<span class="number">58.1</span><span class="regexp">/:8080/</span></span><br><span class="line">ab -n <span class="number">1000</span> -c <span class="number">100</span> http:<span class="regexp">//</span><span class="number">192.168</span>.<span class="number">58.1</span>:<span class="number">8080</span><span class="regexp">/spike/</span><span class="number">1</span>/<span class="number">1</span></span><br></pre></td></tr></table></figure>
</li>
</ul>
<ul>
<li><p>解决库存超卖问题，这种方法虽然解决了库存超卖问题，但是还是会出现库存遗留问题，还是需要使用Lua脚本来解决库存遗留问题：</p>
  <figure class="highlight mipsasm"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">#使用监听和事务，事务监听在事务之前就要使用</span></span><br><span class="line"></span><br><span class="line"><span class="comment">#进行键监听</span></span><br><span class="line"><span class="keyword">jedis.watch(&#x27;需要监听的key&#x27;);</span></span><br><span class="line"><span class="keyword"></span></span><br><span class="line"><span class="comment">#开启乐观锁，在需要进行事务操作的部分将使用原来的jedis使用为Transaction来进行操作</span></span><br><span class="line">Transaction <span class="keyword">multi </span>= <span class="keyword">jedis.multi();</span></span><br><span class="line"><span class="keyword"></span><span class="comment">#使用返回的multi来使用乐观锁</span></span><br><span class="line"><span class="keyword">multi.sadd(key,value);</span></span><br><span class="line"><span class="keyword"></span><span class="comment">#没有问题之后执行exec方法提交执行的语句</span></span><br><span class="line">List&lt;Object&gt; results = <span class="keyword">multi.exec();</span></span><br></pre></td></tr></table></figure>
  <figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br><span class="line">71</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment">* 该方法会出现库存遗留问题</span></span><br><span class="line"><span class="comment">*/</span></span><br><span class="line"><span class="meta">@GetMapping(&quot;/spike/&#123;userId&#125;/&#123;prodId&#125;&quot;)</span></span><br><span class="line"><span class="keyword">public</span> <span class="type">boolean</span> <span class="title function_">doSecKill</span><span class="params">(<span class="meta">@PathVariable</span> String prodId, <span class="meta">@PathVariable</span> String userId)</span> &#123;</span><br><span class="line">    <span class="comment">//userId和prodId非空判断</span></span><br><span class="line">    <span class="keyword">if</span> (userId == <span class="literal">null</span> || prodId == <span class="literal">null</span>) &#123;</span><br><span class="line">        <span class="keyword">return</span> <span class="literal">false</span>;</span><br><span class="line">    &#125;</span><br><span class="line">    userId = String.valueOf(<span class="keyword">new</span> <span class="title class_">Random</span>().nextInt());</span><br><span class="line"></span><br><span class="line">    <span class="comment">//连接jedis</span></span><br><span class="line">    <span class="comment">//Jedis jedis = new Jedis(&quot;192.168.162.132&quot;, 6379);</span></span><br><span class="line"></span><br><span class="line">    <span class="comment">//获取连接池</span></span><br><span class="line">    <span class="type">JedisPool</span> <span class="variable">jedisPool</span> <span class="operator">=</span> JedisPoolUtil.getJedisPoolInstance();</span><br><span class="line">    <span class="comment">//通过连接池获取jedis对象</span></span><br><span class="line">    <span class="type">Jedis</span> <span class="variable">jedis</span> <span class="operator">=</span> jedisPool.getResource();</span><br><span class="line"></span><br><span class="line"></span><br><span class="line">    <span class="comment">//3 拼接key。 3.1 库存key</span></span><br><span class="line">    <span class="type">String</span> <span class="variable">kcKey</span> <span class="operator">=</span> <span class="string">&quot;sk:&quot;</span> + prodId + <span class="string">&quot;:qt&quot;</span>;</span><br><span class="line">    <span class="comment">// 3.2 秒杀成功用户key</span></span><br><span class="line">    <span class="type">String</span> <span class="variable">userKey</span> <span class="operator">=</span> <span class="string">&quot;sk:&quot;</span> + prodId + <span class="string">&quot;:user&quot;</span>;</span><br><span class="line"></span><br><span class="line">    <span class="comment">//增加乐观锁，监视库存</span></span><br><span class="line">    jedis.watch(kcKey);</span><br><span class="line"></span><br><span class="line">    <span class="type">Object</span> <span class="variable">key</span> <span class="operator">=</span> jedis.get(kcKey);</span><br><span class="line">    <span class="comment">//4、获取库存，如果库存null，秒杀还没有开始</span></span><br><span class="line">    <span class="keyword">if</span> (key == <span class="literal">null</span>) &#123;</span><br><span class="line">        System.out.println(<span class="string">&quot;秒杀还没有开始，请等待&quot;</span>);</span><br><span class="line">        jedis.close();</span><br><span class="line">        <span class="keyword">return</span> <span class="literal">false</span>;</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="comment">//5、判断用户是否重复秒杀操作</span></span><br><span class="line">    <span class="keyword">if</span> (jedis.sismember(userKey, userId)) &#123;</span><br><span class="line">        System.out.println(<span class="string">&quot;已经秒杀成功，不能重复秒杀&quot;</span>);</span><br><span class="line">        jedis.close();</span><br><span class="line">        <span class="keyword">return</span> <span class="literal">false</span>;</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="comment">//6、判断如果商品数量，库存数量小于1，秒杀结束</span></span><br><span class="line">    <span class="keyword">if</span> (Integer.parseInt(jedis.get(kcKey)) &lt; <span class="number">1</span>) &#123;</span><br><span class="line">        System.out.println(<span class="string">&quot;秒杀已结束&quot;</span>);</span><br><span class="line">        jedis.close();</span><br><span class="line">        <span class="keyword">return</span> <span class="literal">false</span>;</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="comment">//7、秒杀过程</span></span><br><span class="line"></span><br><span class="line">    <span class="comment">//使用事务</span></span><br><span class="line">    <span class="type">Transaction</span> <span class="variable">multi</span> <span class="operator">=</span> jedis.multi();</span><br><span class="line">    <span class="comment">//组队操作</span></span><br><span class="line">    multi.decr(kcKey);</span><br><span class="line">    multi.sadd(userKey, userId);</span><br><span class="line">    <span class="comment">//执行</span></span><br><span class="line">    List&lt;Object&gt; results = multi.exec();</span><br><span class="line">    <span class="keyword">if</span> (results == <span class="literal">null</span> || results.size() == <span class="number">0</span>) &#123;</span><br><span class="line">        System.out.println(<span class="string">&quot;秒杀失败了 ..... &quot;</span>);</span><br><span class="line">        jedis.close();</span><br><span class="line">        <span class="keyword">return</span> <span class="literal">false</span>;</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="comment">//秒杀成功</span></span><br><span class="line">    System.out.println(<span class="string">&quot;秒杀成功&quot;</span>);</span><br><span class="line">    jedis.close();</span><br><span class="line"></span><br><span class="line">    <span class="keyword">return</span> <span class="literal">true</span>;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
</li>
</ul>
<ul>
<li><p>解决高并发下的库存遗留问题，用户的数量超过库存的数量，结果因为乐观锁导致库存没有卖完，使用 <code>Lua</code>脚本语言来解决</p>
  <figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">import</span> org.slf4j.LoggerFactory;</span><br><span class="line"><span class="keyword">import</span> redis.clients.jedis.HostAndPort;</span><br><span class="line"><span class="keyword">import</span> redis.clients.jedis.Jedis;</span><br><span class="line"><span class="keyword">import</span> redis.clients.jedis.JedisPool;</span><br><span class="line"><span class="keyword">import</span> java.io.IOException;</span><br><span class="line"><span class="keyword">import</span> java.util.HashSet;</span><br><span class="line"><span class="keyword">import</span> java.util.Set; </span><br><span class="line"></span><br><span class="line"><span class="keyword">public</span> <span class="keyword">class</span> <span class="title class_">SpikeRedisByScript</span> &#123;</span><br><span class="line">    <span class="keyword">private</span> <span class="keyword">static</span> <span class="keyword">final</span> org.slf4j.<span class="type">Logger</span> <span class="variable">logger</span> <span class="operator">=</span> LoggerFactory.getLogger(SpikeRedisByScript.class);</span><br><span class="line"></span><br><span class="line">    <span class="comment">//这是一段Lua脚本</span></span><br><span class="line">    <span class="keyword">static</span> <span class="type">String</span> <span class="variable">secKillScript</span> <span class="operator">=</span><span class="string">&quot;local userid=KEYS[1];\r\n&quot;</span> +</span><br><span class="line">            <span class="string">&quot;local prodid=KEYS[2];\r\n&quot;</span> +</span><br><span class="line">            <span class="string">&quot;local qtkey=&#x27;sk:&#x27;..prodid..\&quot;:qt\&quot;;\r\n&quot;</span> +</span><br><span class="line">            <span class="string">&quot;local usersKey=&#x27;sk:&#x27;..prodid..\&quot;:usr\&quot;;\r\n&quot;</span> +</span><br><span class="line">            <span class="string">&quot;local userExists=redis.call(\&quot;sismember\&quot;,usersKey,userid);\r\n&quot;</span> +</span><br><span class="line">            <span class="string">&quot;if tonumber(userExists)==1 then \r\n&quot;</span> +</span><br><span class="line">            <span class="string">&quot;   return 2;\r\n&quot;</span> +</span><br><span class="line">            <span class="string">&quot;end\r\n&quot;</span> +</span><br><span class="line">            <span class="string">&quot;local num= redis.call(\&quot;get\&quot; ,qtkey);\r\n&quot;</span> +</span><br><span class="line">            <span class="string">&quot;if tonumber(num)&lt;=0 then \r\n&quot;</span> +</span><br><span class="line">            <span class="string">&quot;   return 0;\r\n&quot;</span> +</span><br><span class="line">            <span class="string">&quot;else \r\n&quot;</span> +</span><br><span class="line">            <span class="string">&quot;   redis.call(\&quot;decr\&quot;,qtkey);\r\n&quot;</span> +</span><br><span class="line">            <span class="string">&quot;   redis.call(\&quot;sadd\&quot;,usersKey,userid);\r\n&quot;</span> +</span><br><span class="line">            <span class="string">&quot;end\r\n&quot;</span> +</span><br><span class="line">            <span class="string">&quot;return 1&quot;</span> ;</span><br><span class="line"></span><br><span class="line">    <span class="keyword">static</span> <span class="type">String</span> <span class="variable">secKillScript2</span> <span class="operator">=</span></span><br><span class="line">            <span class="string">&quot;local userExists=redis.call(\&quot;sismember\&quot;,\&quot;&#123;sk&#125;:0101:usr\&quot;,userid);\r\n&quot;</span> +</span><br><span class="line">                    <span class="string">&quot; return 1&quot;</span>;</span><br><span class="line"></span><br><span class="line">    <span class="keyword">public</span> <span class="keyword">static</span> <span class="type">boolean</span> <span class="title function_">doSecKill</span><span class="params">(String uid, String prodid)</span> <span class="keyword">throws</span> IOException &#123;</span><br><span class="line"></span><br><span class="line">        <span class="type">JedisPool</span> <span class="variable">jedispool</span> <span class="operator">=</span> JedisPoolUtil.getJedisPoolInstance();</span><br><span class="line">        <span class="type">Jedis</span> <span class="variable">jedis</span> <span class="operator">=</span> jedispool.getResource();</span><br><span class="line"></span><br><span class="line">        <span class="type">String</span> <span class="variable">sha1</span> <span class="operator">=</span> jedis.scriptLoad(secKillScript);</span><br><span class="line">        <span class="type">Object</span> <span class="variable">result</span> <span class="operator">=</span> jedis.evalsha(sha1, <span class="number">2</span>, uid, prodid);</span><br><span class="line"></span><br><span class="line">        <span class="type">String</span> <span class="variable">reString</span> <span class="operator">=</span> String.valueOf(result);</span><br><span class="line">        <span class="keyword">if</span> (<span class="string">&quot;0&quot;</span>.equals(reString)) &#123;</span><br><span class="line">            System.err.println(<span class="string">&quot;已抢空！！&quot;</span>);</span><br><span class="line">        &#125; <span class="keyword">else</span> <span class="keyword">if</span> (<span class="string">&quot;1&quot;</span>.equals(reString)) &#123;</span><br><span class="line">            System.out.println(<span class="string">&quot;抢购成功！！！！&quot;</span>);</span><br><span class="line">        &#125; <span class="keyword">else</span> <span class="keyword">if</span> (<span class="string">&quot;2&quot;</span>.equals(reString)) &#123;</span><br><span class="line">            System.err.println(<span class="string">&quot;该用户已抢过！！&quot;</span>);</span><br><span class="line">        &#125; <span class="keyword">else</span> &#123;</span><br><span class="line">            System.err.println(<span class="string">&quot;抢购异常！！&quot;</span>);</span><br><span class="line">        &#125;</span><br><span class="line">        jedis.close();</span><br><span class="line">        <span class="keyword">return</span> <span class="literal">true</span>;</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
</li>
</ul>
<h2 id="持久化-RDB"><a href="#持久化-RDB" class="headerlink" title="持久化-RDB"></a>持久化-RDB</h2><h2 id="持久化-AOF"><a href="#持久化-AOF" class="headerlink" title="持久化-AOF"></a>持久化-AOF</h2><p><strong>AOF（Append Only File）：追加文件，不允许改写文件，记录编写的指令和数据</strong></p>
<ul>
<li>RDB默认开启的，AOF默认是不开启的，需要在配置文件中开启，将appendonly的值设置为 yes，</li>
<li>AOF的文件生成的路径是和RDB文件的生成路径是一致的</li>
<li><strong>如果AOF和RDB同时开启，系统默认读取AOP的数据</strong></li>
</ul>
</article><div class="post-copyright"><div class="post-copyright__title"><span class="post-copyright-info"><h>Redis</h></span></div><div class="post-copyright__type"><span class="post-copyright-info"><a href="https://www.naste.top:1024/posts/bae4ff13.html">https://www.naste.top:1024/posts/bae4ff13.html</a></span></div><div class="post-copyright-m"><div class="post-copyright-m-info"><div class="post-copyright-a"><h>作者</h><div class="post-copyright-cc-info"><h>XiaoFei🥝</h></div></div><div class="post-copyright-c"><h>发布于</h><div class="post-copyright-cc-info"><h>2022-06-20</h></div></div><div class="post-copyright-u"><h>更新于</h><div class="post-copyright-cc-info"><h>2024-04-26</h></div></div><div class="post-copyright-c"><h>许可协议</h><div class="post-copyright-cc-info"><a class="icon" rel="noopener" target="_blank" title="Creative Commons" href="https://creativecommons.org/"><i class="fab fa-creative-commons"></i></a><a rel="noopener" target="_blank" title="CC BY-NC-SA 4.0" 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href="/posts/7273cdc.html"><img class="next-cover" src= "" data-lazy-src="https://www.naste.top:9000/webp/1515952743797.webp" onerror="onerror=null;src='/assets/r2.jpg'" alt="cover of next post"><div class="pagination-info"><div class="label">下一篇</div><div class="next_info">Maven</div></div></a></div></nav><div class="relatedPosts"><div class="headline"><i class="fas fa-thumbs-up fa-fw"></i><span>相关推荐</span></div><div class="relatedPosts-list"><div><a href="/posts/333814905.html" title="SpringBoot使用SpringCache进行缓存"><img class="cover" src= "" data-lazy-src="https://www.naste.top:9000/webp/1669778318.webp" alt="cover"><div class="content is-center"><div class="date"><i class="fas fa-history fa-fw"></i> 2024-04-26</div><div class="title">SpringBoot使用SpringCache进行缓存</div></div></a></div></div></div><hr/><div id="post-comment"><div class="comment-head"><div class="comment-headline"><i class="fas fa-comments fa-fw"></i><span> 评论</span></div></div><div class="comment-wrap"><div><div id="twikoo-wrap"></div></div></div></div></div><div class="aside-content" id="aside-content"><div class="sticky_layout"><div class="card-widget" id="card-toc"><div class="item-headline"><svg class="meta_icon" style="width:22px;height:22px;position:relative;top:5px"><use xlink:href="#icon-mulu1"></use></svg><span style="font-weight:bold">目录</span><span class="toc-percentage"></span></div><div class="toc-content"><ol class="toc"><li class="toc-item toc-level-1"><a class="toc-link" href="#Redis"><span class="toc-text">Redis</span></a><ol class="toc-child"><li class="toc-item toc-level-2"><a class="toc-link" href="#%E4%B8%80%E3%80%81Redis%E7%9A%84%E5%AE%89%E8%A3%85%E5%92%8C%E5%90%AF%E5%8A%A8%E5%92%8C%E5%85%B3%E9%97%AD"><span class="toc-text">一、Redis的安装和启动和关闭</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#%E4%BA%8C%E3%80%81%E5%B8%B8%E7%94%A8%E4%BA%94%E5%A4%A7%E6%95%B0%E6%8D%AE%E7%B1%BB%E5%9E%8B"><span class="toc-text">二、常用五大数据类型</span></a><ol class="toc-child"><li class="toc-item toc-level-3"><a class="toc-link" href="#Redis%E9%94%AE%E5%80%BC%EF%BC%88key%EF%BC%89"><span class="toc-text">Redis键值（key）</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#Redis-%E5%AD%97%E7%AC%A6%E4%B8%B2%EF%BC%88String%EF%BC%89"><span class="toc-text">Redis 字符串（String）</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#Redis%E5%88%97%E8%A1%A8%EF%BC%88List%EF%BC%89"><span class="toc-text">Redis列表（List）</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#Redis%E9%9B%86%E5%90%88%EF%BC%88Set%EF%BC%89"><span class="toc-text">Redis集合（Set）</span></a></li></ol></li><li class="toc-item toc-level-2"><a class="toc-link" href="#%E4%B8%89%E3%80%81SpringBoot%E6%95%B4%E5%90%88Redis"><span class="toc-text">三、SpringBoot整合Redis</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#%E5%9B%9B%E3%80%81Redis-%E4%BA%8B%E5%8A%A1"><span class="toc-text">四、Redis_事务</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#%E4%BA%94%E3%80%81%E7%A7%92%E6%9D%80%E9%97%AE%E9%A2%98"><span class="toc-text">五、秒杀问题</span></a><ol class="toc-child"><li class="toc-item toc-level-3"><a class="toc-link" href="#1%E3%80%81%E6%AF%8F%E6%AC%A1%E5%8F%AA%E6%9C%89%E4%B8%80%E4%B8%AA%E7%94%A8%E6%88%B7%E8%BF%9B%E8%A1%8C%E7%A7%92%E6%9D%80"><span class="toc-text">1、每次只有一个用户进行秒杀</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#2%E3%80%81%E6%A8%A1%E6%8B%9F%E9%AB%98%E5%B9%B6%E5%8F%91%E4%B8%8B%E7%9A%84%E5%9C%BA%E6%99%AF%E8%BF%9B%E8%A1%8C%E7%A7%92%E6%9D%80"><span class="toc-text">2、模拟高并发下的场景进行秒杀</span></a></li></ol></li><li class="toc-item toc-level-2"><a class="toc-link" href="#%E6%8C%81%E4%B9%85%E5%8C%96-RDB"><span class="toc-text">持久化-RDB</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#%E6%8C%81%E4%B9%85%E5%8C%96-AOF"><span 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    if( document.getElementById('gitZone') && (location.pathname ==='/personal/about/'|| '/personal/about/' ==='all')){
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        GitCalendarInit("https://gitcalendar.naste.top/api?xiao-i-fei",['#d9e0df', '#c6e0dc', '#a8dcd4', '#9adcd2', '#89ded1', '#77e0d0', '#5fdecb', '#47dcc6', '#39dcc3', '#1fdabe', '#00dab9'],'xiao-i-fei')
    }
  </script><!-- hexo injector body_end end --></body></html>